Calculating machines; Calculating scales; Calculators; Calculators and calculating machines; Microscope condensers; Microscope illuminating devices; Microscope objectives; Mouse pads; Smart watches; Electronic calculators; Electronic signaling mechanism, namely, a train control system used in the railway industry for detecting and controlling trains, ground faults, broken rails, power failures, track switches and lights; Laboratory equipment, namely, microscope slides; Operating microscope st...